The first volume of the SCALE series, 'OPEN | CLOSE' examines a simple but effective building element, the Opening, illuminating the path from idea to realization in its various facets.The concept of OPEN | CLOSE includes not only elements such as windows, doors, gates, loggias and skylights, which communicate between exterior and interior space, but also the structure of the building itself. Because Openings define and determine the relationship of the building to public space, they also determine the character of the site. The analysis of conception, form and construction of opening elements is supplemented and illustrated by international examples of best applications.